Instead of injecting a medicine, some men insert a suppository of alprostadil into the urethra. What you can do Take these steps to prepare for your appointment: Ask what you need to do ahead of time. Alternative medicine Before using any supplement, check with your doctor to make sure it’s safe for you — especially if you have chronic health conditions. What sites do you recommend? Testosterone treatment also has not been proven to help ED associated with age-related or late-onset hypogonadism. Oral medicines for ED usually work well and cause few side effects. Severe liver disease.Breastfeeding For professionals Drug Images What is Viagra? Viagra is a brand-name prescription drug that’s approved to treat erectile dysfunction (ED). With ED, you’re unable to have or. Interactions with drugs or supplements. nitrate drugs, such as nitroglycerin (Nitro-Dur) alpha-blocker drugs, such as prazosin (Minipress) blood pressure drugs, . How oral medicines differ. Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it .